Jeff Russell

Founder at @marmosetco
Graphics, Engineering, and the like

[Jeff Russell @j3ffdr]

@swadeart @JoeWilsonEQ1 now we're cooking

[Jeff Russell @j3ffdr]

Let's add some more orientations. "Metal" normal maps, rotated 45 degrees off the tangent plane. "Vulkan" normals, skewed, etc

[Joe Wilson @JoeWilsonEQ1]

I am begging the 3D industry: can we please, please stop calling these DirectX and OpenGL. These are left- and right-handed tangent space normal maps.

DirectX and OpenGL are graphics APIs. They do not determine your coordinate system or tangent orientation/handedness.

[DrElliot @MrDrElliot]

The future of graphics programming is one where these un-necessary abstractions to get data to shaders is removed, and we only care about raw data and pointer arithmetic.

[Jeff Russell @j3ffdr]

dunno why everyone is calling it "ideation" these days. we had a perfectly sane and reasonable and in no way weird term for this already: "brainstorming"

[Peter Shirley 🔮🛡 @Peter_shirley]

Procedural tree generation bug (real photo)

[Jeff Russell @j3ffdr]

@ThatNgonGuy LBDs unite!

[Vlad Erium 🇯🇵 @ssh4net]

Ultra-fast Screen-Space Refractions and Caustics via Newton’s Method

Chase Mayer, Ulf Assarsson, Erik Sintorn

Paper: https://t.co/H4ytv7ddLw
Code (MIT): https://t.co/rMOycSo5hZ

Abstract
We introduce a novel screen-space refraction method that replaces standard ray marching with Newton’s method for root finding. For each pixel, we define a function as the difference between the refracted ray depth and the G-buffer depth, and iteratively refine the intersection using the tangent plane of the current G-buffer point. This achieves rapid convergence, typically within only a few iterations, thereby reducing per-pixel cost. We further analyze common failure cases, such as depth discontinuities or poor initial guesses, and propose practical strategies to detect and then mitigate or resolve them. We also demonstrate our approach on refracted light rays to accelerate screen-space caustics.

[Jordan Cain @ThatNgonGuy]

Bevel shader in @marmosetco makes modeling so much more fun. I'm over here just worrying about shapes and not caring about topo. It's so freeing.

[Pete Mc Nally @petesonearth]

Look dev on cobwebs in Toolbag and #3dsmax #madewithmarmoset

[Dan Olson @olson_dan]

My book about Rust is now actually released and available!

I wrote this specifically for C++ programmers. Check it out if you are interested.

[CobaltDragon @Cobalt__Dragon]

@FFmpeg Could you please also fragment the release builds into at least 20 executables in a nested interdependent directory structure of >= 657 files? Having a single exe that just does its job well is disconcerting. I'm much more comfortable when I don't know what's happening.

[Marmoset @marmosetco]

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[Steve Ruiz @steveruizok]

me, scoffing in the back row of SIGGRAPH: ok I guess this is good if I ever need to render a teapot I guess??

[Ignacio Castaño @castano]

I've been reverse engineering Apple's, ARM's, and ImgTec's hardware image compression formats. ARM's AFRC is the clear winner, but does native hardware compression make real-time texture encoding obsolete?

https://t.co/goDn1E5U27

[Soufiane KHIAT @SoufianeKHIAT]

Finally! All of that for just showing a dynamic illustration in app!
Bunch of algorithms was implemented for this dynamic illustration.
WIP version available (https://t.co/4ZMIat8pqU no LaTeX yet!)
Depends on ImPlatform for custom shaders https://t.co/mKI1Rn2HUF
1/4

[Simpsons Daily Glavins 🏳️‍🌈🏳️‍⚧️ @simpsons_DG]

You ugly, hate-filled picture format!

[Daniel Lemire @lemire]

Daniel Lemire, "How many branches can your CPU predict?," in Daniel Lemire's blog, March 18, 2026, https://t.co/C2aQvXmhbt.

[Eric Lengyel @EricLengyel]

New blog post: A Decade of Slug
This talks about the evolution of the Slug font rendering algorithm, and it includes an exciting announcement: The patent has been dedicated to the public domain.
https://t.co/xWEz0q2c4N

[Ivan Rouzanov @ivanrouzanov]

This is a very narrow view. Software did not just destroy multiple orders of magnitude of performance improvements in hardware. We also made the user experience much, much worse. You're welcome.

[GameVerse @TheGameVerse]

Hackers got DOOM running on a pregnancy test.